Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aaeb50e7ad7787…

MALICIOUS

PDF

93.3 KB Created: 2020-08-02 04:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d75e26b7dfcdaa1d4f974fbe11f70bde SHA-1: 7c89c014bbf41ec7037d021da212e3cc4e123398 SHA-256: 20aaeb50e7ad7787be3c437ae6952f5de0142ad3fc3c53111326505b17e1d60b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious link is https://ttraff.cc/pify?keyword=alt+code+arrow, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and contains some of the URLs, suggesting a lure to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=alt+code+arrow
    • http://files.flyingpigrvpark.com/uploads/1/3/2/6/132681985/dupapevov_vusufobevodawo_birezakunan.pdf
    • http://files.irishcca.com/uploads/1/3/1/3/131398455/4269468.pdf
    • http://files.florenceecarol.com/uploads/1/3/1/6/131637374/a35e0018c884.pdf
    • http://files.cencalproperty.com/uploads/1/3/1/6/131606125/7bb5b2a30d.pdf
    • http://files.millianconstruction.com/uploads/1/3/0/7/130776089/215758afbcc.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/62885650849.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/binexipekukowape.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1284/files/varutilobib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/zidigoganadigaluvojugavow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/dijetozadufawigawenu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/mefasirigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/88786784438.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/git_show_origin.pdf
    • https://cdn.shopify.com/s/files/1/0437/2489/8453/files/fatenesabobage.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/ragaguxukawigaliguxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/kifunedo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c68a.bin
5f8a71c3f95c7345d053c105d6a343798365c187ecc09dba28c1780abf4eb193		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC68A 16856 bytes
font_00_sfnt_off0000abca.bin
201e40a703655a780df4dc648cd6cee5db3161f2ed562f058badb4daa98f06a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABCA 2876 bytes
font_01_sfnt_off0000b604.bin
c406083f3bcac69e75456f7770b3ba55c707d95b40bdf5f3b0a907b202257569		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 4836 bytes
font_03_sfnt_off0000f257.bin
06c89c4650a70cf1bbe052fb879b929fbd66ce3c4344b873bd11610c9516d4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 15120 bytes
font_04_sfnt_off000120f3.bin
04d5dbdbfe1b04cbebca1412425c4c69ea8110a33b2f8915fbfedf937a82b393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 28664 bytes
font_05_sfnt_off0001552d.bin
5e7557c2e6839ee57df8d112244173bbc2c1c53f23841530ee17c2eb8ecd513c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1552D 6200 bytes

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